<template>
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card class="box-card">
      <!-- 头部的警告区域 -->
      <el-alert title="注意:只允许第三级分类设置相关参数!" type="warning" :closable="false"
       show-icon>
      </el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
            <el-cascader
            expand-trigger="hover"
            :options="catelist"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange">
            </el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
          <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnisabled" @click="addDialogVisible = true">添加参数</el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染Tag标签 -->
                  <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!-- 输入的文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加的按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!-- 添加静态属性的面板 -->
          <el-tab-pane label="静态属性" name="only">
            <!-- 添加属性按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnisabled" @click="addDialogVisible = true">添加属性</el-button>
            <!-- 静态属性表格 -->
            <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <!-- 添加的按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
                </el-table-column>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!-- 修改参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        // 商品分类列表
        catelist: [],
        // 级联选择框的配置对象
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        // 级联选择框双向绑定到的数组
        selectedCateKeys: [],
        // 被激活的页签名称
        activeName: 'many',
        // 动态参数的数据
        manyTableData: [],
        // 静态属性的数据
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name: [
            { required: true, message:'请输入参数名称', trigger: 'blur'}
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改参数的表单数据对象
        editForm: {
          att_name: ''
        },
        // 修改表单的验证规则对象
        editFormRules: {
          attr_name: [
            { required: true, message:'请输入参数名称', trigger: 'blur'}
          ]
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有商品分类列表
      async getCateList () {
        const {data: res} = await this.$http.get('categories')
        if (res.meta.status !== 200 ) {
          return this.$message.error('获取商品分类失败!')
        }
        console.log(res.data)
        this.catelist = res.data
      },
      // 级联选择框选中项变化，会触发这个函数
      handleChange () {
       this.getParamsData()
      },
      // tab 页签点击事件的处理函数
      handleTabClick () {
        console.log(this.activeName)
        this.getParamsData()
      },
      // 获取参数的列表数据
      async getParamsData () {
        // 证明选中的不是三级分类
        if(this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        // 证明选中的是三级分类
        console.log(this.selectedCateKeys)
        //根据所选分类的Id,和当前所处的面板，获取对应的参数
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: this.activeName }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // f文本框中输入的值
          item.inputValue = ''
        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        }else {
          this.onlyTableData = res.data
        }
      },
      // 监听添加对话框的关闭事件
      addDialogClosed () {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮，添加参数
      addParams () {
        this.$refs.addFormRef.validate(async valid => {
          if(!valid) return
          const { data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮，展示修改对话框
      async showEditDialog (attr_id) {
        // 查询当前参数的信息
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params:{attr_sel: this.activeName}
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 重置修改的表单
      editDialogClosed () {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮，修改参数
      editParams () {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name: this.editForm.attr_name, attr_sel: this.activeName})
          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败')
          }
          this.$message.success('修改参数成功')
          this.editDialogVisible = false
          this.getParamsData()
        })
      },
      // 根据id删除对应的参数项
      async removeParams (attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数,是否断续?','删除', {
          confirmButtonText:'确定',
          cancelButtonText:'取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除!')
        }
        // 删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败!')
        }
        this.$message.success('删除参数成功!')
        this.getParamsData()
      },
      // 文本框失去焦点，或摁下了 Enter都会触发
      handleInputConfirm (row) {
        if(row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        // 如果没有return,则证明输入了内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      // 将对attr_vals的操作，保存到数据库
      async saveAttrVals(row) {
        // 需要发起请求，保存这次操作
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败!')
        }
        this.$message.success('修改参数项成功!')
      },
      // 点击按钮，展示文本输入框
      showInput (row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回凋函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 删除对应的参数可选项
      handleClose (i, row) {
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },
    computed: {
      // 如果按钮需要被禁用，则返回true,否则返回false
      isBtnisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的三级分类Id
      cateId () {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText () {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>
